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Anode and preparation method thereof, lithium battery

A lithium battery and negative electrode technology, applied in the field of negative electrode and its preparation, can solve the problems of strong corrosion, poor stability of LiF layer, etc., and achieve the effect of improving safety performance

Active Publication Date: 2019-01-04
桑德新能源技术开发有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, this method generates fluorine gas, which is extremely corrosive, so it is required that the material of the equipment used cannot react with fluorine gas; Reacts with water vapor to produce impurities such as oxides or hydroxides in the LiF layer, which deteriorates the stability of the LiF layer

Method used

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  • Anode and preparation method thereof, lithium battery
  • Anode and preparation method thereof, lithium battery

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Embodiment approach

[0060] According to one embodiment of the negative electrode of the present invention, it includes: a lithium negative electrode sheet; LiF layers deposited on the first and second surfaces of the lithium negative electrode sheet respectively; LiAlF deposited on the LiF layer respectively 4 layer.

[0061] This embodiment is the above-mentioned double-sided deposition. During double-sided deposition, the winding or stacking assembly method of the all-solid-state battery can be realized. When this assembly method is adopted, due to the LiAlF 4 layer, can reduce the amount of solid electrolyte or omit the addition of solid electrolyte (when LiAlF 4 When the thickness of the layer is large), the energy density of the all-solid-state battery can thus be improved.

[0062] According to one embodiment of the negative electrode of the present invention, the thickness of the lithium negative electrode sheet is 0.8um to 1000um; the thickness of the LiF layer is 10nm to 200nm, preferab...

Embodiment 1

[0091] (1) Provide lithium negative electrode sheet: hot pressing of metal lithium foil. The specific operation is as follows:

[0092] Using commercial lithium metal foil with a thickness of 1000um as raw material, adjust the width of the hot press roller to 100um in the argon glove box, put the metal lithium foil from the entrance, turn on the hot press, and set the hot press to two times. The temperature of the pressing roller is 25°C, and the metal lithium foil is stretched and thinned by mechanical driving, and a 100um metal lithium foil is obtained at the exit, which is a lithium negative electrode sheet.

[0093] (2) S1: Deposit LiF layer on the first side of the lithium negative electrode by magnetron sputtering method; S2: Deposit LiAlF on the LiF layer on the first side by magnetron sputtering method 4 layer. The specific operation is as follows:

[0094] Place the metal lithium foil with a thickness of 100um on the base of VTC-600-3HD three-target magnetron sputt...

Embodiment 2

[0096] (1) Provide lithium negative electrode sheet: hot pressing of metal lithium foil. The specific operation is as follows:

[0097] Using commercial lithium metal foil with a thickness of 1000um as the raw material, adjust the roller pressure gap width of the hot press to 50um in an argon glove box, put the lithium metal foil from the entrance, turn on the hot press, and set the temperature of the hot press. The temperature of the two pressure rollers is 120°C, and the metal lithium foil is stretched and thinned by mechanical driving, and a 50um metal lithium foil is obtained at the exit.

[0098] (2) S1: Deposit LiF layer on the first side of the lithium negative electrode by magnetron sputtering method; S2: Deposit LiAlF on the LiF layer on the first side by magnetron sputtering method 4 layer. The specific operation is as follows:

[0099] Place the first side of the metal lithium foil with a thickness of 50um upwards on the base of the VTC-600-3HD three-target magne...

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Abstract

The invention relates to a negative electrode and a preparation method thereof, and a lithium battery comprising the negative electrode. The negative electrode according to the invention comprises a lithium negative electrode sheet; A LiF layer deposited on at least one side of the lithium negative electrode sheet; A LiAlF4 layer deposited on the LiF layer. The lithium battery of the present invention includes a negative electrode of the present invention. The preparation method of the negative electrode of the invention comprises the following steps: providing a lithium negative electrode sheet; Depositing a LiF layer on at least one side of a lithium negative electrode sheet by a magnetron sputtering method; LiAlF4 layer was deposited on LiF layer by magnetron sputtering, and lithium anode was obtained. According to the negative electrode of the invention, the growth of the lithium dendrite can be prevented, thereby ensuring the safety performance of the lithium battery including thenegative electrode of the invention; The lithium battery including the negative electrode of the present invention can also be guaranteed to have good lithium ion conductivity. The preparation methodof the invention does not discharge fluorine gas, has no special requirements for the material of the reaction vessel or the equipment, and ensures the stability of the lithium negative electrode sheet, the LiF layer and the LiAlF4 layer.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a negative electrode, a preparation method thereof, and a lithium battery. Background technique [0002] Commercial liquid lithium-ion batteries contain liquid organic electrolytes with low ignition points, which are prone to safety problems such as leakage, flammability and explosion, which largely limit the application fields of liquid lithium-ion batteries. With the gradual popularization of large-scale energy storage devices such as electric vehicles and smart grids, higher requirements are put forward for the energy density and safety performance of lithium-ion batteries. Among them, the safety performance of liquid lithium-ion batteries is partly caused by the growth of lithium dendrites on the lithium negative electrode during charging and discharging. [0003] Compared with liquid lithium-ion batteries, all-solid-state batteries have certain advantages in impro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/62H01M4/1395H01M4/04H01M10/0525
CPCH01M4/0426H01M4/134H01M4/1395H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 陈渊周美丽倪海芳
Owner 桑德新能源技术开发有限公司
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